The Doctor, Amy and Rory are in New York City on a beautiful summer's day. Rory sets off to get coffee and walks into a 1930s film noir where daughter River Song is a private detective, Melody Malone. Actually, Amy and the Doctor have the whole story written down in a cheap paperback but the Doctor forbids her to read too far ahead because once they know what happens, it cannot be changed. As for Rory, he finds that the Weeping Angels are there. Several attempts to travel back in the TARDIS are unsuccessful but they manage to break through. They find that the angels have taken over New York and the only way to stop them is to create a paradox - but not everyone will survive.
—garykmcd